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Tricholomopsis rutilans

[ Basidiomycetes > Agaricales > Tricholomataceae > Tricholomopsis . . . ]

by Michael Kuo

Appearing in conifer forests across the continent, Tricholomopsis rutilans is a saprobe that decays fallen wood. It is easily recognized by the densely packed, bright red to purplish red fibers and scales on the cap and stem, covering the yellow surfaces beneath almost entirely when the mushroom is young. The gills are yellow, the spore print is white, and there is no partial veil. Under the microscope, Tricholomopsis rutilans features abundant large, inflated cheilocystidia.


Ecology: Saprobic on the well decayed wood of conifers; occasionally found in woodchips, sawdust, and lignin-rich soil; growing alone, scattered or small troops; summer and fall (also winter and spring in warm climates); widely distributed in North America.

Cap: 3-12 cm; convex with an incurved margin, becoming broadly convex, broadly bell-shaped, or nearly flat; dry; densely covered with red to purplish red or brick red fibers; with maturity the fibers aggregating into small scales and the yellow ground color beneath showing through.

Gills: Attached to the stem; close or crowded; yellow.

Stem: 4-12 cm long; up to 2 cm thick; yellow, covered with red fibers like those on the cap--but often more sparsely, especially in age; with a yellow, fiber-less zone at the extreme apex.

Flesh: Yellow to pale yellow.

Odor and Taste: Odor fragrant or not distinctive; taste mild or slightly radishlike.

Chemical Reactions: KOH red on cap surface.

Spore Print: White.

Microscopic Features: Spores 5-7 x 3-5 µ; smooth; broadly elliptical or drop-shaped; inamyloid. Pleurocystidia occasional; often barely projecting beyond basidia. Cheilocystidia abundant; variously shaped (clavate, fusoid-ventricose, fusoid-cylindric, etc.); up to 100 x 30 µ; often collapsing. Pileipellis a cutis; hyphae 5-15 µ wide; reddish in KOH. Clamp connections present.

REFERENCES: (Schaeffer, 1774) Singer, 1939. (Fries, 1821; Saccardo, 1887; Kauffman, 1918; Smith, 1949; Smith, 1960; Smith, 1975; Smith, Smith & Weber, 1979; Arora, 1986; States, 1990; Breitenbach & Krãnzlin, 1991; Phillips, 1991/2005; Lincoff, 1992; Evenson, 1997; Barron, 1999; Roody, 2003; McNeil, 2006; Miller & Miller, 2006; Kuo, 2007; Trudell & Ammirati, 2009.) Herb. Kuo 09220605.

This site contains no information about the edibility or toxicity of mushrooms.


Tricholomopsis rutilans

Tricholomopsis rutilans

Tricholomopsis rutilans

Tricholomopsis rutilans

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Kuo, M. (2013, March). Tricholomopsis rutilans. Retrieved from the MushroomExpert.Com Web site: